ML20084U027

LER BFRO-50-259/775:on 770126,condenser Vacuum Switches PS-2-1A,2A & 8A Found Operating Below Tech Spec Limits. Caused by Setpoint Drift.Switches Reset

ML20084U027
Person / Time
Site:	Browns Ferry
Issue date:	02/09/1977
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-259-775, NUDOCS 8306270011
Download: ML20084U027 (2)

Text

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. , glCENSEE EVENT REPORTc\ _) - '

• Y CONTR5L ELOCK:l l l l l l l

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[ PLEA 1E PZINT ALL REIUIREJ INFORMATION) 1 6

• E TYPE LctNSE NuMBEA ua))E AlLlB] R] Fj 1l l 0 l 0 l-l 0 l 0 l 0 l 0 ] 0 \-l0 l 0l l4l1 l1l1l1l l0l1l T 14 15 25 26 30 31 32 IE9 EVENT CATE AEPoAT CATE .

DOCKET NUMBEA hCON'T l CAT EGORY l*l T E d59 d60 l0 l5 l0 l-l0 I2 l 5 l968l l0I1l2l6l7!7l 69 74 l

75 l l l l l 80 l

57 SB 61 7 8 EVENT DESCRIPTION j Up l During northal operation, condenser vacuum switches PS-2-1A, PS-2-1B and PS-2-8A 80 we 7 89 .

Switches would have performed intended l

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c l found to operate bel'ow Tech. Spec. limit. 60 Switches were reset and l

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89- This is a repetitive problem.

g l function if req: tired. 60 uO 35] ] fuTictionally tested satisfactorily. As-found setpoints were 22.4, 22.8 and 22.760in.He.

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'Es] 9l Specified setpoint is 23 in. Hg. BFRO-50-259/775 80 pave 7 is 9 M FO VCLATON 3 lIlAl (E_)

E CODE COMPONENT CODE lIlNlSlTlRlUl17 lN l 44 l Bl 0] 7l 0l47 W 48 12 43

'B9 10 11 CAUSE CESCRIP110N l Q l Pressure switches had drif ted from setpo' int with no evidence of failure or 80 7 89 Switches reset and functionally tested. l,

$ l malfunction. Barksdale model'DIT-H18SS 80 T 89 l ul.9 7 METHOD CF FACLITY DtSCOVEAY DSCOVERY DESCAiPTON

% POWER OTHER STATUS status Surveillance testing l Q lCl l 0l 6l 6] l NA 44 l @45 46 l 50 7 8 9 10 12 13 LOCATON OF AELEASE 0 AE AMOUNT OF ACTMTY AELE SED NA l

!2 ASE l NA l l 80 10 11 44 45 .

7. 8 9 PERSONNEL EXPOSURES TYPE CESCA;PTON NUMBf9  !

ITElIniniol 11 1.tj 12 l

13 NA SO 7 89 PERSONNEL INJURLES f;UMBEn DESCAiPION l NA 14 l0 l 0l 0l l 80 7 89 11 12 OFFSITE CONSEQUENCES

• l NA 33 l eO 7 89 770209 LOSS OR DAMAGE TO FACILITY g 6 00g10S000 OC R TYPE ot SCA.PTON '

pg l .

S h1l 7 89 10 ,

NA 80 PUBUCITY NA l

@l 7 89 80 ADDITIONAL FACTORS l

l 80 7 69 '

' I 81 7 89 60

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.- e c TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ol

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Mr.' Norman C. Moseley, Director /A U.S. Nuclear Regulatory Commission ".

Office of Inspection and Enforcement Y Y Region II 230 Peachtree Street, NW., Suite 1217 4 g fu Atlanta, Georgia 30303 ,

Dear Mr. Moseley:

T-TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 -

DOCKET No. 50-259 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-259/775 The enclosed report is to provide details concerning condenser vacuum switches PS-2-1A, PS-2-1B, and PS-2-8A that were found to operate below technical specification limits during normal operation. This report is submitted in accordance with Browns Ferry Technical Specifications Section 6. This event occurred on Browns Ferry Nuclear Plant unit 1.

Very truly yours, TENNESSEE VALLEY AUTHORITY H. S. Fox Director of Power Production Enclosure (3)

CC (Enclosure): -

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Director (3) '

Office of Manag ent Information and Program Control U.S. Nuclear Re,ulatory Commission Washington, D.C. 20555 Director (40)

,. Office of Inspection and Enforcement ,

t U.S. Nuclear Regulatory Commission .

Washington, D.C. 20555 1564 S &

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l An Equal Opportunity Employer

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